Function.php

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<?php
class PHPExcel_Calculation_Function {
        /* Function categories */
        const CATEGORY_CUBE                                             = 'Cube';
        const CATEGORY_DATABASE                                 = 'Database';
        const CATEGORY_DATE_AND_TIME                    = 'Date and Time';
        const CATEGORY_ENGINEERING                              = 'Engineering';
        const CATEGORY_FINANCIAL                                = 'Financial';
        const CATEGORY_INFORMATION                              = 'Information';
        const CATEGORY_LOGICAL                                  = 'Logical';
        const CATEGORY_LOOKUP_AND_REFERENCE             = 'Lookup and Reference';
        const CATEGORY_MATH_AND_TRIG                    = 'Math and Trig';
        const CATEGORY_STATISTICAL                              = 'Statistical';
        const CATEGORY_TEXT_AND_DATA                    = 'Text and Data';

        private $_category;

        private $_excelName;

        private $_phpExcelName;

    public function __construct($pCategory = NULL, $pExcelName = NULL, $pPHPExcelName = NULL)
    {
        if (($pCategory !== NULL) && ($pExcelName !== NULL) && ($pPHPExcelName !== NULL)) {
                // Initialise values
                $this->_category                = $pCategory;
                $this->_excelName               = $pExcelName;
                $this->_phpExcelName    = $pPHPExcelName;
        } else {
                throw new PHPExcel_Calculation_Exception("Invalid parameters passed.");
        }
    }

    public function getCategory() {
        return $this->_category;
    }

    public function setCategory($value = null) {
        if (!is_null($value)) {
                $this->_category = $value;
        } else {
                throw new PHPExcel_Calculation_Exception("Invalid parameter passed.");
        }
    }

    public function getExcelName() {
        return $this->_excelName;
    }

    public function setExcelName($value) {
        $this->_excelName = $value;
    }

    public function getPHPExcelName() {
        return $this->_phpExcelName;
    }

    public function setPHPExcelName($value) {
        $this->_phpExcelName = $value;
    }
}